Multiregex

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- Included a py.typed file to indicate that the package is fully typed.

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- Fix exception when mixing patterns with prematchers and without prematchers.

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**Breaking change:** Prematchers now support non-ASCII characters. This will render all custom prematchers potentially invalid. **Please update your custom prematchers.**

Other changes:

- Add support for `.fullmatch`.
- Add a prematcher profiler.
- Up to 2x speedup in ``.search/.match/.fullmatch``.

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Initial release.